CN102049587A - Temperature control system for large temperature difference adjustment of reflow soldering machine and temperature control method - Google Patents
Temperature control system for large temperature difference adjustment of reflow soldering machine and temperature control method Download PDFInfo
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- CN102049587A CN102049587A CN2009102187558A CN200910218755A CN102049587A CN 102049587 A CN102049587 A CN 102049587A CN 2009102187558 A CN2009102187558 A CN 2009102187558A CN 200910218755 A CN200910218755 A CN 200910218755A CN 102049587 A CN102049587 A CN 102049587A
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Abstract
The invention discloses a temperature control system for the large temperature difference adjustment of a reflow soldering machine and a temperature control method. The control system comprises a programmable logic controller, a plurality of cold air transmission pipelines, refrigerating systems, temperature detection units as well as electromagnetic valves installed on the cold air transmission pipelines and controlled by the programmable logic controller, and the programmable logic controller is connected with heating mechanisms arranged in upper and lower temperature subareas of a plurality of temperature areas. The temperature control method comprises the following steps: 1, newly set temperatures for the upper and the lower temperature subareas in the plurality of temperature areas are input respectively to the programmable logic controller; and 2, the programmable logic controller performs control and adjustment to the temperatures of the upper and the lower temperature subareas in the plurality of temperature areas, including quick temperature adjustment, appropriate temperature adjustment and heat preservation. The temperature control system has the advantages of reasonable design and good use effect, is convenient for installation, arrangement and wiring, and is easy to operate. Besides solving the problem of slow temperature reduction, the temperature control system is used for rapidly and conveniently adjusting the temperature difference between adjacent temperature areas, and addresses the difficulty in setting a temperature difference between an upper temperature area and a lower temperature area of a PCB (Printed Circuit Board).
Description
Technical field
The invention belongs to reflow machine temperature control system technical field, especially relate to the big temperature difference adjustment of a kind of reflow machine with temperature control system and temperature-controlled process.
Background technology
At present, continuous tunnel furnace and reflow machine often adopt the raise temperature of each warm area of the method for hot air circulation heating.In the actual use, when design temperature reduces, stop the method that hot air circulation lowers the temperature corresponding warm area temperature naturally and lower the temperature thereby only can adopt, thereby temperature-fall period is slow, length consuming time.Simultaneously, because the influence of heat transfer process adopts this kind temperature-controlled process also to be difficult to the temperature difference amplitude of adjacent warm area design temperature is widened.In addition, in actual mechanical process, because it is poor to be positioned at the part temperature capacity on pcb board top, pcb board top warm area temperature often need be lower than bottom warm area temperature in welding process, and existing temperature-controlled process also can't solve the problem of the temperature difference between same warm area middle and upper part warm area and bottom warm area design temperature being controlled adjustment.
Summary of the invention
Technical problem to be solved by this invention is at above-mentioned deficiency of the prior art, and the big temperature difference adjustment of a kind of reflow machine reasonable in design, easy for installation, that cost is low and intelligent degree is high temperature control system is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the big temperature difference adjustment of a kind of reflow machine temperature control system, it is characterized in that: comprise Programmable Logic Controller, a plurality of cold wind conveyance conduits, the refrigeration system that is connected with a plurality of warm areas of reflow machine respectively by a plurality of cold wind conveyance conduits and be installed in a plurality of magnetic valves on described a plurality of cold wind conveyance conduit respectively, described a plurality of magnetic valve all joins with Programmable Logic Controller and its on off state and aperture control to adjust by Programmable Logic Controller, and the quantity of described cold wind conveyance conduit and the magnetic valve all warm area quantity with reflow machine is identical; Described a plurality of warm area is that the boundary is divided into two branch warm areas up and down with the workpiece of welded part walking passage all, and is provided with temperature detecting unit in two branch warm areas up and down of described a plurality of warm areas and described temperature detecting unit all connects Programmable Logic Controller; Going up of described a plurality of warm areas divides the installation through hole that is provided with the installation of supply cold wind conveyance conduit on the warm area, and described refrigeration system divides warm area to be connected with going up of described a plurality of warm areas respectively by a plurality of cold wind conveyance conduits; Described Programmable Logic Controller respectively with two the branch warm areas up and down that are arranged on described a plurality of warm areas in heating arrangements join.
The front and back end portion of described reflow machine is provided with respectively and is used to detect the photoelectric probe that judges whether that welded part inputs or outputs, described workpiece walking passage is provided with the holes probe that its speed of travel is detected in real time, and photoelectric probe and holes probe all connect Programmable Logic Controller.
Described heating arrangements is that hot air circulation mechanism and described hot air circulation mechanism comprise heating blower, electric heater and the motor that joins with electric heater.
Described temperature detecting unit is a thermocouple.
Described refrigeration system is the cooling air compressor.
Described workpiece walking passage is pressed the delivery chain of planned orbit motion for driving welded part.
Described Programmable Logic Controller is the PID controller.
Simultaneously, the present invention also provide a kind of control set-up procedure simple, realize convenient and the good big temperature difference adjustment of the reflow machine temperature-controlled process of temperature control effect, it is characterized in that this method may further comprise the steps:
Step 1, import the new settings temperature of dividing warm area in described a plurality of warm area up and down respectively to Programmable Logic Controller;
201, fast temperature adjustment: Programmable Logic Controller is with the new settings temperature T of input branch warm area Ai
Newly establishWith with the former design temperature of adjacent minute warm area of minute warm area Ai and divide the former design temperature of warm area Ai to compare: work as T
Newly establishWhen being lower than the former design temperature of adjacent minute warm area and this warm area, Programmable Logic Controller 10 controls divide the magnetic valve that institute is installed on the cold wind conveyance conduit in the warm areas of warm area Ai place to move, and opening described refrigeration system carries out fast cooling with transporting cold wind in minute warm area Ai; Work as T
Newly establishWhen being higher than the former design temperature of adjacent minute warm area and this warm area, Programmable Logic Controller, Controlled by Programmable Controller divides the heating arrangements of being installed in the warm area Ai to open to be rapidly heated;
202, the appropriateness temperature is adjusted: in the fast temperature adjustment process, Programmable Logic Controller is with the actual temperature T of the real-time branch warm area Ai that transmits of described temperature detecting unit
RealWith T
Newly establishCompare analysis, and judgement draws T according to the comparative analysis result
RealWith T
Newly establishBetween when differing Δ T, Programmable Logic Controller tackles the magnetic valve described in the step 201 mutually or heating arrangements carries out closing control: work as T
Real＜T
Newly establishThe time, handle the ON time of tackling magnetic valve described in the step 201 mutually by Programmable Logic Controller according to internal analysis and control; Work as T
Real＞T
Newly establishThe time, handle the shut-in time of tackling heating arrangements described in the step 201 mutually by Programmable Logic Controller according to internal analysis and control; Treat that ON time finishes or the shut-in time then, described magnetic valve or heating arrangements are closed automatically, and this moment T
Real=T
Newly establishΔ T is for entering the preset temperature difference of appropriateness temperature during the adjusting stage to Programmable Logic Controller input;
203, insulation: work as T
Real=T
Newly establishThe time, by Programmable Logic Controller the magnetic valve described in the step 201 is carried out corresponding control, make the actual temperature T of branch warm area Ai
RealKeep stable.
Described in the above-mentioned steps 202 carry out being incubated described in adjustment of appropriateness temperature and the step 203 time, Programmable Logic Controller adopts the PID control method that described magnetic valve is carried out corresponding control.
The present invention compared with prior art has the following advantages:
1, used temperature control system is simple in structure, reasonable in design, and each assembly lays easy for installation and the circuit part wiring is simple, and cost is low.
2, the fast and weak point consuming time of cooling, in the temperature-fall period, the cold wind circulation can be taken away a large amount of heats, quickens cooling rate, and the warm area temperature can reach design temperature at short notice.
3, each warm area decibel is provided with independently cold wind input system and hot air circulating system, between warm area temperature difference adjustment fast, convenient and control adjustment mode is flexible, compare design temperature when low when one of them warm area is adjacent warm area, the temperature-fall period difficulty is big under the heat transfer process influence; Because each warm area is provided with independently cold wind input system, each warm area adjustment is very flexible.
4, it is relatively independent that soldered pcb board divides the control of warm area temperature up and down, because being arranged at going up of pcb board, the cold air input port divides warm area, when circulating cold air is imported, the last warm area temperature of dividing will be lower than following minute warm area temperature, and can adjust upper and lower temperature difference easily by changing cold air flow velocity and time, thereby very the actual demand of the part temperature capacity difference that is positioned at pcb board top can be fully satisfied in invention.
5, applied widely, can be widely used in continuous tunnel furnace and reflow machine.
In sum, the present invention is reasonable in design, laying and easy-to-connect are installed, simple to operate and result of use good, solving cooling simultaneously slowly, can adjust the temperature difference between the adjacent warm area quickly and easily, and solved pcb board up and down warm area set the difficult problem of the temperature difference, have cooling fast, adjacent and up and down between warm area temperature difference dynamic range big and adjust advantages such as quick and convenient.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the installation position structural representation of temperature control system of the present invention.
Fig. 2 is the circuit former road block diagram of the big temperature difference adjustment of reflow machine of the present invention with temperature control system.
Fig. 3 carries out temperature controlled method flow diagram for the present invention to reflow machine.
Description of reference numerals:
The 1-PCB plate; The 2-photoelectric probe; The 3-heating blower;
The 4-motor; The 5-delivery chain; The 6-magnetic valve;
The 7-holes probe; 8-cold wind conveyance conduit; 9-cooling air compressor;
The 10-Programmable Logic Controller; The 11-thermocouple; The 12-electric heater.
The specific embodiment
As shown in Figure 1 and Figure 2, the big temperature difference adjustment of reflow machine of the present invention temperature control system, the refrigeration system that comprise Programmable Logic Controller 10, a plurality of cold wind conveyance conduit 8, is connected by a plurality of cold wind conveyance conduits 8 respectively with a plurality of warm areas of reflow machine and be installed in a plurality of magnetic valves 6 on described a plurality of cold wind conveyance conduit 8 respectively.Described a plurality of magnetic valve 6 all joins with Programmable Logic Controller 10 and its on off state and aperture control to adjust by Programmable Logic Controller 10, and the quantity of described cold wind conveyance conduit 8 and the magnetic valve 6 all warm area quantity with reflow machine is identical.Described a plurality of warm area is that the boundary is divided into two branch warm areas up and down with the workpiece of welded part walking passage all, and is provided with temperature detecting unit in two branch warm areas up and down of described a plurality of warm areas and described temperature detecting unit all connects Programmable Logic Controller 10.Going up of described a plurality of warm areas divides the installation through hole that is provided with 8 installations of supply cold wind conveyance conduit on the warm area, and described refrigeration system divides warm area to be connected with going up of described a plurality of warm areas respectively by a plurality of cold wind conveyance conduits 8.Described Programmable Logic Controller 10 respectively with two the branch warm areas up and down that are arranged on described a plurality of warm areas in heating arrangements join.
In the present embodiment, the front and back end portion of described reflow machine is provided with respectively and is used to detect the photoelectric probe 2 that judges whether that welded part inputs or outputs, described workpiece walking passage is provided with the holes probe 7 that its speed of travel is detected in real time, and photoelectric probe 2 and holes probe 7 all connect Programmable Logic Controller 10.Described heating arrangements is that hot air circulation mechanism and described hot air circulation mechanism comprise heating blower 3, electric heater 12 and the motor 4 that joins with electric heater 12, and described temperature detecting unit is a thermocouple 11, and described refrigeration system is a cooling air compressor 9.Described workpiece walking passage is pressed the delivery chain 5 of planned orbit motion for driving welded part.Described Programmable Logic Controller 10 is the PID controller.Described welded part is a pcb board 1.
As shown in Figure 3, the big temperature difference adjustment of reflow machine of the present invention temperature-controlled process may further comprise the steps:
Step 1, import the new settings temperature of dividing warm area in described a plurality of warm area up and down respectively to Programmable Logic Controller 10.
201, fast temperature adjustment: Programmable Logic Controller 10 is with the new settings temperature T of input branch warm area Ai
Newly establishWith with the former design temperature of adjacent minute warm area of minute warm area Ai and divide the former design temperature of warm area Ai to compare: work as T
Newly establishWhen being lower than the former design temperature of adjacent minute warm area and this warm area, Programmable Logic Controller 10 controls divide magnetic valve 6 actions of installing in the warm area of warm area Ai place on the cold wind conveyance conduit 8, and opening described refrigeration system carries out fast cooling with transporting cold wind in minute warm area Ai; Work as T
Newly IfWhen being higher than the former design temperature of adjacent minute warm area and this warm area, Programmable Logic Controller 10, Programmable Logic Controller 10 controls divide the heating arrangements of being installed in the warm area Ai to open to be rapidly heated;
202, the appropriateness temperature is adjusted: in the fast temperature adjustment process, Programmable Logic Controller 10 is with the actual temperature T of the real-time branch warm area Ai that transmits of described temperature detecting unit
RealWith T
Newly establishCompare analysis, and judgement draws T according to the comparative analysis result
RealWith T
Newly establishBetween when differing Δ T, Programmable Logic Controller 10 is tackled the magnetic valve 6 described in the step 201 mutually or heating arrangements carries out closing control: work as T
Real＜T
Newly IfThe time, handle the ON time of tackling magnetic valve described in the step 201 6 mutually by Programmable Logic Controller 10 according to internal analysis and control; Work as T
Real＞T
Newly establishThe time, handle the shut-in time of tackling heating arrangements described in the step 201 mutually by Programmable Logic Controller 10 according to internal analysis and control; Treat that ON time finishes or the shut-in time then, described magnetic valve 6 or heating arrangements are closed automatically, and this moment T
Real=T
Newly establishΔ T is for entering the preset temperature difference of appropriateness temperature during the adjusting stage to Programmable Logic Controller 10 input;
203, insulation: work as T
Real=T
Newly establishThe time, carry out corresponding control by the magnetic valve 6 described in 10 pairs of steps 201 of Programmable Logic Controller, make the actual temperature T of branch warm area Ai
RealKeep stable.
In the present embodiment, described in the step 202 carry out being incubated described in adjustment of appropriateness temperature and the step 203 time, Programmable Logic Controller 10 adopts the PID control methods that described magnetic valve 6 is carried out corresponding control.During practical operation, described in the step 1 to Programmable Logic Controller 10 import respectively described in the new settings temperature of dividing warm area in described a plurality of warm area up and down and the step 202 when Programmable Logic Controller 10 inputs enter the preset temperature difference of appropriateness temperature during the adjusting stage, import by the parameter set unit of joining with Programmable Logic Controller 10, for example the computer that joins with Programmable Logic Controller 10.
In sum, in the actual use, soldered pcb board 1 is positioned on the delivery chain 5, under the drive of motor 4, import reflow machine, photoelectric probe 2 places the warm area front end of reflow machine, be used to judge whether pcb board 1 input, holes probe 7 is used to measure the movement rate of pcb board 1, the time that the movement rate by photoelectric probe 2 positions, each warm area width and pcb board 1 can calculate pcb board 1 input and export each warm area.The on off operating mode of the magnetic valve of being installed on the open and close state of 10 pairs of storage heaters 3 of Programmable Logic Controller and the cold air input channel 86 is controlled, and in conjunction with the PID control method, makes this warm area reach design temperature and keeps stable state.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
Claims (9)
1. the big temperature difference adjustment of reflow machine temperature control system, it is characterized in that: comprise Programmable Logic Controller (10), a plurality of cold wind conveyance conduits (8), the refrigeration system that is connected with a plurality of warm areas of reflow machine respectively by a plurality of cold wind conveyance conduits (8) and be installed in a plurality of magnetic valves (6) on described a plurality of cold wind conveyance conduits (8) respectively, described a plurality of magnetic valve (6) all joins with Programmable Logic Controller (10) and its on off state and aperture control to adjust by Programmable Logic Controller (10), and all the warm area quantity with reflow machine is identical for the quantity of described cold wind conveyance conduit (8) and magnetic valve (6); Described a plurality of warm area is that the boundary is divided into two branch warm areas up and down with the workpiece of welded part walking passage all, and is provided with temperature detecting unit in two branch warm areas up and down of described a plurality of warm areas and described temperature detecting unit all connects Programmable Logic Controller (10); Going up of described a plurality of warm areas divides the installation through hole that is provided with supply cold wind conveyance conduit (8) installation on the warm area, and described refrigeration system divides warm area to be connected with going up of described a plurality of warm areas respectively by a plurality of cold wind conveyance conduits (8); Described Programmable Logic Controller (10) respectively with two the branch warm areas up and down that are arranged on described a plurality of warm areas in heating arrangements join.
2. according to the big temperature difference adjustment of the described reflow machine of claim 1 temperature control system, it is characterized in that: the front and back end portion of described reflow machine is provided with respectively and is used to detect the photoelectric probe (2) that judges whether welded part and input or output, described workpiece walking passage is provided with the holes probe (7) that its speed of travel is detected in real time, and photoelectric probe (2) and holes probe (7) all connect Programmable Logic Controller (10).
3. according to claim 1 or the big temperature difference adjustment of 2 described reflow machines temperature control system, it is characterized in that: described heating arrangements is that hot air circulation mechanism and described hot air circulation mechanism comprise heating blower (3), electric heater (12) and the motor (4) that joins with electric heater (12).
4. according to claim 1 or the big temperature difference adjustment of 2 described reflow machines temperature control system, it is characterized in that: described temperature detecting unit is thermocouple (11).
5. according to claim 1 or the big temperature difference adjustment of 2 described reflow machines temperature control system, it is characterized in that: described refrigeration system is cooling air compressor (9).
6. according to claim 1 or the big temperature difference adjustment of 2 described reflow machines temperature control system, it is characterized in that: described workpiece walking passage is pressed the delivery chain (5) of planned orbit motion for driving welded part.
7. according to claim 1 or the big temperature difference adjustment of 2 described reflow machines temperature control system, it is characterized in that: described Programmable Logic Controller (10) is the PID controller.
8. one kind is utilized the big temperature difference adjustment of the described reflow machine of claim 1 to carry out temperature controlled method with temperature control system, it is characterized in that this method may further comprise the steps:
Step 1, import the new settings temperature of dividing warm area in described a plurality of warm area up and down respectively to Programmable Logic Controller (10);
Step 2, by Programmable Logic Controller (10) according to described new settings temperature automatically to dividing the temperature of warm area to control adjustment up and down in described a plurality of warm areas, and in the temperature control adjustment process, described temperature detecting unit in real time to each minute warm area actual temperature detect and with institute's detection signal synchronous driving to Programmable Logic Controller (10), for any one controlled minute warm area Ai, its temperature controlled processes is as follows:
201, fast temperature adjustment: Programmable Logic Controller (10) is with the new settings temperature T of input branch warm area Ai
Newly establishWith with the former design temperature of adjacent minute warm area of minute warm area Ai and divide the former design temperature of warm area Ai to compare: work as T
Newly establishWhen being lower than the former design temperature of adjacent minute warm area and this warm area, Programmable Logic Controller (10) control divides that the magnetic valve (6) on institute's cold wind conveyance conduit of installing (8) moves in the warm area of warm area Ai place, opens described refrigeration system and carries out fast cooling with transporting cold wind in minute warm area Ai; Work as T
Newly establishWhen being higher than the former design temperature of adjacent minute warm area and this warm area, Programmable Logic Controller (10), Programmable Logic Controller (10) control divides the heating arrangements of being installed in the warm area Ai to open to be rapidly heated;
202, the appropriateness temperature is adjusted: in the fast temperature adjustment process, Programmable Logic Controller (10) is with the actual temperature T of the real-time branch warm area Ai that transmits of described temperature detecting unit
RealWith T
Newly establishCompare analysis, and judgement draws T according to the comparative analysis result
RealWith T
Newly establishBetween when differing Δ T, Programmable Logic Controller (10) is tackled the magnetic valve described in the step 201 (6) mutually or heating arrangements carries out closing control: work as T
Real＜T
Newly establishThe time, handle the ON time of tackling magnetic valve described in the step 201 (6) mutually by Programmable Logic Controller (10) according to internal analysis and control; Work as T
Real＞T
Newly establishThe time, handle the shut-in time of tackling heating arrangements described in the step 201 mutually by Programmable Logic Controller (10) according to internal analysis and control; Treat that ON time finishes or the shut-in time then, described magnetic valve (6) or heating arrangements are closed automatically, and this moment T
Real=T
Newly establishΔ T is for entering the preset temperature difference of appropriateness temperature during the adjusting stage to Programmable Logic Controller (10) input;
203, insulation: work as T
Real=T
Newly establishThe time, by Programmable Logic Controller (10) magnetic valve described in the step 201 (6) is carried out corresponding control, make the actual temperature T of branch warm area Ai
RealKeep stable.
9. according to the big temperature difference adjustment of the described reflow machine of claim 8 temperature-controlled process, it is characterized in that: described in the step 202 carry out being incubated described in adjustment of appropriateness temperature and the step 203 time, Programmable Logic Controller (10) adopts the PID control method that described magnetic valve (6) is carried out corresponding control.
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| CN117464216A (en) * | 2023-12-28 | 2024-01-30 | 江苏函杰机床有限公司 | Welding quality control method and device based on real-time measurement of laser welding temperature field |
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Application publication date: 20110511 |